Date: Tue, 23 Apr 2024 07:19:23 +0200 From: Gerrit =?UTF-8?B?S8O8aG4=?= <gerrit.kuehn@aei.mpg.de> To: Dag-Erling =?UTF-8?B?U23DuHJncmF2?= <des@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: possible regression handling packet fragmentation in 14.0 with tftp/pxe Message-ID: <20240423071923.52b90652@arc.aei.uni-hannover.de> In-Reply-To: <86o7a18ppl.fsf@ltc.des.dev> References: <20240419153951.5a23ce5f@arc.aei.uni-hannover.de> <86y1999wwe.fsf@ltc.des.dev> <20240422075948.5bb856ac@arc.aei.uni-hannover.de> <86o7a18ppl.fsf@ltc.des.dev>
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[-- Attachment #1 --]
Am Mon, 22 Apr 2024 15:57:42 +0200
schrieb Dag-Erling Smørgrav <des@FreeBSD.org>:
> Off the top of my head, it means the packet length according to its
> header is longer than the capture length but the MF flag is not set.
> Historically, it meant you needed to increase tcpdump's snaplen, but
> these days it defaults to 256 kB so it shouldn't matter. It might be a
> bug in bpf, or an interaction between pf and bpf.
So maybe this is rather a red herring than a pointer to the actual
difference in packet handling.
> There were changes in tftpd, but I don't know if that's relevant.
Most certainly not as I didn't touch the server side. The tftpd there is
certainly old, but it worked fine up to FreeBSD 13.3 on the router. It is
the update to 14.0 that triggered the problem.
cu
Gerrit
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